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A2485 Not charging. Fan spin. minor liquid damage on charge FETs

S

SolderFungus

New member
I have a A2485 that got a tiny streak of liquid damage on the on the FETs for charging the battery. Q5232 and Q5233. (Picture provided)

Q5233 - CHGR_GATE_Q2 appeared to be shorted to GND. 0.00 in Diode mode.
I cleaned pin 1-4 with some flux and solder and that appeared to relieve the short. D 0.430


Q5232 - PPDCIN_AON_CHGR_R 20V
CHGR_PHASE1 - 11V

I have tried to replace the battery with no luck.
Device will run without usb-c charger connected, but it will not charge. All other functions on the device appears to be working.
Requesting troubleshooting guidance. Thank you.

damage.jpg
 
2informaticos

2informaticos

Administrator
Staff member
Check all the resistors and traces associated with U5200 and its related MOSFETs.

Post CHGR_BGATE voltage, with charger and battery connected.
 
S

SolderFungus

New member
CHGR_BGATE
Disconnected 3.6V
Connected battery no charger 2V
Battery and charger 2.6V
Started with charger then disconnect charger 3V



Q5232
PPDCIN_AON_CHGR_R D. .620 R 31.4K
CHRG_PHASE1 D .468 R 91mO
CHRG_GATE_Q1 D .700
Values are not settling

Q233
CHGR_GATE_Q1 D .421



R5217 (10K 1%) measures 8.93K Diode reading is .550 (AUX_DET_SHORT)
CHGR_AUX_DET in diode mode is 0.460 while OBDATA says 0.549
Those are the only measurement with a noteworthy deviation around U5200




PPVVBAT_AON 1.170 in diode mode. (OBDATA : 1.630)
Q5270 SAVE_BAD_D Diode 1.170 ( OBDATA 1.625)



Q5240
CHGR_GATE_Q3 Diode 0.0 R 0.01ohm no OBDATA
CHGR_GATE_Q4 Diode Ol R OL no OBDATA
Rest on Q5240 is same as OBDATA at D 0.485/0
 
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